param([switch]$QwenOnly)
$ErrorActionPreference = 'Stop'
$taskRoot = 'D:\web\zyt'
$phpBinary = 'D:\phpstudy_pro\Extensions\php\php8.2.9nts\php.exe'
$expected = @{ qwen = 22252; openai = 22300 }
if ($QwenOnly) { $expected.qwen = 37984 }
$stamp = Get-Date -Format 'yyyyMMdd-HHmmss'
$receipt = @()
$lanes = if ($QwenOnly) { @('qwen') } else { @('qwen', 'openai') }
foreach ($lane in $lanes) {
    $checkArgs = @("$taskRoot\artifacts\prescription-ai-runtime\retry_qwen.php")
    if ($lane -eq 'openai') { $checkArgs += '--openai' }
    $checkText = & $phpBinary @checkArgs
    if ($LASTEXITCODE -ne 0) { throw "Queue eligibility changed for $lane" }
    $check = $checkText | ConvertFrom-Json
    if (-not $check.eligible -or $check.running_model_tasks -ne 0) { throw "Worker is not idle: $lane" }
    $workers = @(Get-CimInstance Win32_Process -Filter "Name='php.exe'" | Where-Object { $_.CommandLine -match "prescription-ai:work --lane=$lane(?:\s|$)" })
    if ($workers.Count -ne 1 -or $workers[0].ProcessId -ne $expected[$lane] -or $workers[0].ExecutablePath -ne $phpBinary) {
        throw "Worker identity changed: $lane"
    }
    Stop-Process -Id $workers[0].ProcessId -ErrorAction Stop
    Wait-Process -Id $workers[0].ProcessId -Timeout 10 -ErrorAction SilentlyContinue
    $outPath = "$taskRoot\artifacts\prescription-ai-runtime\$lane-$stamp.stdout.log"
    $errPath = "$taskRoot\artifacts\prescription-ai-runtime\$lane-$stamp.stderr.log"
    $started = Start-Process -FilePath $phpBinary -ArgumentList @('think', 'prescription-ai:work', "--lane=$lane") -WorkingDirectory "$taskRoot\server" -WindowStyle Hidden -RedirectStandardOutput $outPath -RedirectStandardError $errPath -PassThru
    $receipt += [pscustomobject]@{ lane = $lane; old_pid = $workers[0].ProcessId; new_pid = $started.Id; started_at = (Get-Date).ToString('o'); stdout = $outPath; stderr = $errPath }
}
$receipt | ConvertTo-Json -Depth 3 | Set-Content -LiteralPath "$taskRoot\artifacts\prescription-ai-runtime\model-worker-restart-$stamp.json" -Encoding utf8
$receipt | ConvertTo-Json -Depth 3